Matthew 17:8

They looked up and saw no one but Jesus Himself.

Mark 9:8

And as quick as a flash, on looking around, they saw no one with them but Jesus by Himself.

Luke 9:36

When the voice had ceased, Jesus was found to be alone. And they kept silence and told no one anything that they had seen at that time.

Acts 12:10-11

They passed the first guard, then the second, and at last came to the iron gate which led into the city. The gate of itself opened to them, and they passed out and proceeded one block when all at once the angel left him.

Treasury of Scripture Knowledge

Summary

And when they had lifted up their eyes, they saw no man, save Jesus only.

Bible References

They saw

Mark 9:8
And as quick as a flash, on looking around, they saw no one with them but Jesus by Himself.
Luke 9:36
When the voice had ceased, Jesus was found to be alone. And they kept silence and told no one anything that they had seen at that time.
Acts 12:10
They passed the first guard, then the second, and at last came to the iron gate which led into the city. The gate of itself opened to them, and they passed out and proceeded one block when all at once the angel left him.